Used when passing the chimney through the ceiling
It is used together with rain collar
| Dv, mm | Dvi, mm | α=0-15 | α=15-30 | α=30-45 |
| A, mm | ||||
| 350 | 360 | 735 | 730 | 740 |
| 360 | 370 | 745 | 740 | 750 |
| 400 | 410 | 785 | 780 | 790 |
| 420 | 430 | 805 | 800 | 810 |
| 450 | 460 | 835 | 830 | 855 |
| 460 | 470 | 845 | 840 | 865 |
| 500 | 510 | 885 | 885 | 910 |
| 520 | 530 | 905 | 905 | 930 |
| 550 | 560 | 935 | 935 | 965 |
| 560 | 570 | 945 | 945 | 980 |
| 600 | 610 | 985 | 990 | 985 |